Category: <b>virus/antivirus</b>
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<pre><b>INT 21 - VIRUS - "905"/"Backfont" - INSTALLATION CHECK</b>

	AX = C301h
	DX = F1F1h
Return: DX = 0E0Eh if resident
SeeAlso: AH=C0h"VIRUS",AX=C500h"VIRUS"
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